president obama just boarding air force one just moments ago. he will be heade headed to south africa for the funeral of nelson mandela. >> welcome back to aljazeera america. i'm del walters. in mexico city, thousands of protestors are taking to the streets. we'll tell it will you why they're so upset about proposed changes for the state run oil company in a molt. first, let's find out whether all this snow and ice are going to continue across the nation today. >> temperatures are going to stay cold enough for some areas to continue with the wintery weather we've been dealing with across mainly northern new england. right now, it's minus forein denver, freezing in memphis, 22 in chicago. if you like it warm, the only place in the u.s. is down across florida, who are already in the 60's and 70's. the dakota, it's minus 10 right now in fargo. dropped to 30 degrees or better below zero. we have those dangerously cold conditions in place. it feels like minus 15 in minneapolis. temperatures are going to stay blow average. in the mideast, mid 30's bac